SCIENCE CHINA
Chemistry
submit stencil
• SUPPORTING INFORMATION •
January 2010 Vol.53 No.1: 1–8
doi: 10.1007/s11426-010-0012-4
Efficiency enhancement of P3HT/PCBM polymer solar cells with
oligomers DH4T as the third component
FU Ping,ac YANG Dong, ac ZHANG Fujun,b YU Wei,ac ZHANG Jian,a* LI Can a*
a
State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences and Dalian National Laboratory for
Clean Energy, Dalian 116023, China.
b
Key Laboratory of Luminescence and Optical Information , Ministry of Education, Beijing 100044, China
c
University of Chinese Academy of Sciences, Beijing 100049, China
Received September **, ****; accepted **
*Corresponding author (email: jianzhang@dicp.ac.cn and canli@dicp.ac.cn)
1, Figure S1:TEM and HRTEM images of P3HT: PC61BM films and P3HT:DH4T:PC61BM (1:0.1:1) films.
Sample preparation: Droping the P3HT:PCBM and P3HT:DH4T:PCBM solvent on 200-mesh copper grids, slowing
growth for one night.
Figure S1:TEM images of P3HT: PC61BM films (a), P3HT:DH4T:PC61BM (1:0.1:1) films (b), and HRTEM images of P3HT: PC61BM films (c),
P3HT:DH4T: PC61BM (1:0.1:1) films (d).
© Science China Press and Springer-Verlag Berlin Heidelberg 2010
chem.scichina.com
www.springerlink.com
2
SHENG Jia, et al.
Sci China Chem
January (2010) Vol.53 No.1
From the TEM images, the width of the fibrillar crystals (Fig.(a)) is approximately 20 nm, which is proper for exciton
transfer, and their length is mostly less than 500 nm. TEM image of (Fig.(b)) has a tendency to form a network interpenetrated nanostructure morphology, although not entirely connecting each other. The width of these crystals remains almost constant compared to the P3HT:PC61BM composite film, but on average their length has increased. In other words, the shorter
fibrillar-like P3HT crystals exist in P3HT:PC61BM film. After adding DH4T, the increased length of the crystals enhances the
formation of a P3HT network interpenetrated nanostructure within the composite film. The continuative growth up into longer fibrils improve phase segregation, which are beneficial to the charge separation and transportation, to obtain higher J sc and
FF.
From the HR-TEM images, we have found the formation of small PC61BM single crystal in the film of P3HT:PC61BM. The
d spacing in these PC61BM crystals is about 0.25 nm. [1] (Adv.Mater. 2004, 16, 9-10).In the film of P3HT:DH4T:PC61BM,
we also have observed the formation of another nanocrystal DH4T (d=0.29nm) in accordance with the result found by Massimo Moret et al.[2] So we speculate that the heterojunction of DH4T and PC61BM is formed, and that photoexcited excitons
might be dissociated efficiently.
2, Table S1: XPS element analysis results of the P3HT, P3HT:DH4T(1:0.1), P3HT:PC61BM and P3HT:DH4T:PC61BM
(1:0.1:1) blend films.
Films
C:S Ratio
P3HT[a]
10
DH4T[a]
7
P3HT
9.2
P3HT:DH4T(1:0.1)
7.67
P3HT:PC61BM
10.23
P3HT: DH4T:PC61BM(1:0.1:1)
9.84
[a] calculated from the molecular formula
[1] X.N. Yang, J.K.J. van Duren, M.T. Rispens, J.C. Hummelen, R.A.J. Janssen, M.A.J. Michels, J. Loos, Crystalline
organization of a methanofullerene as used for plastic solar-cell applications, Advanced Materials, 16 (2004) 802-+.
[2] M. Moret, M. Campione, A. Borghesi, L. Miozzo, A. Sassella, S. Trabattoni, B. Lotz, A. Thierry, Structural
characterisation of single crystals and thin films of alpha,omega-dihexylquaterthiophene, Journal of Materials Chemistry, 15
(2005) 2444-2449.